42-Cx

SRS DTC Troubleshooting: 42-Cx (x can be 0 thru 9 or A thru F)

DTC 42-Cx ("x" can be 0 thru 9 or A thru F): Faulty Power Supply to the Right Front Impact Sensor

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures, Service and Repair General Troubleshooting Information, Reading and Clearing Diagnostic Trouble Codes and Battery Terminal Disconnection and Reconnection. Procedures

1. Clear the DTC memory. Reading and Clearing Diagnostic Trouble Codes

2. Turn the ignition switch to ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

Does the SRS indicator stay on, and is DTC 42-Cx indicated?
YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures. Reading and Clearing Diagnostic Trouble Codes If another DTC is indicated, troubleshoot the DTC.


3. Turn the ignition switch to LOCK (0).

4. Disconnect the negative cable from the battery, then wait at least 3 minutes.

5. Disconnect SRS unit connector A (28P) from the SRS unit. Service and Repair

6. Disconnect the engine compartment wire harness 2P connector (A) from the right front impact sensor.






7. Measure the resistance between SRS unit connector A (28P) terminal No. 28 and body ground. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?
YES - Go to step 8.

NO - Short to ground in the dashboard wire harness or the engine compartment wire harness; replace the faulty harness, then clear the DTC.






8. Measure the resistance between SRS unit connector A (28P) terminals No. 16 and No. 28. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?
YES - Faulty right front impact sensor or SRS unit; replace the right front impact sensor, Front Impact Sensor Replacement then clear the DTC. If the problem is still present, replace the SRS unit. SRS Unit Replacement

NO - Short to another wire in the dashboard wire harness or the engine compartment wire harness; replace the faulty harness, then clear the DTC.